/Engine/Source/Runtime/AnimationCore/Public/BoneWeights.h
Blend two bone weights together, making sure to add in every influence from both, using the given settings. The bias value should lie on the [0,1] interval. Values outside that range may give unwanted results. NOTE: The current container can also be used as an input.
template<typename ContainerTypeA, typename ContainerTypeB, typename CT> std::enable_if<!std::is_const< CT >::value, void >::type Blend ( const [TBoneWeights](API\Runtime\AnimationCore\TBoneWeights)< ContainerTypeA > & InBoneWeightsA, const [TBoneWeights](API\Runtime\AnimationCore\TBoneWeights)< ContainerTypeB > & InBoneWeightsB, float InBias, const [FBoneWeightsSettings](API\Runtime\AnimationCore\FBoneWeightsSettings) & InSettings )